If you are stuck with an iPhone 3GS having newer bootrom (iBoot v 359.3.2) and want it to be jailbreaked here is some great news for you - iH8sn0w Sn0wBreeze utility will soon be upgraded to support tethered jailbreak (meaning you will have to re-jailbreak if your iPhone reboots) of iPhone 3GS having iBoot v 359.3.2. The only catch is that you must have your iOS 3.1.2 ECID saved as you will need to downgrade for this to work.

Another popular jailbreaking utility for Windows Sn0wbreeze got updated to v 1.6.1 supporting the latest iOS4 release, if you are thinking why Sn0wbreeze is needed when we already have redsn0w to jailbreak the newest Apple mobile OS - the answer is Sn0wbreeze lets you create custom firmware IPSW files on Windows (similar to iPhone Dev Team's - PwnageTool utility For Mac) letting you upgrade your devices keeping the older bootrom.

Google's Mobile OS platform Android has now been successfully ported to Apple iPhone by Planetbeing, in an video demonstration Planetbeing demoed a first generation Apple iPhone running Linux kernel and Google's Android mobile operating system.